A possibility offered by (iii) for estimating the degree of under notification of measles cases under more general circumstances appears if one explicitly introduces time, showing that the total number of cases is a weighted average of past births the weights being given by the (normalised) density of infection: G(a) = Λ (a)λ (a)/ 1-Λ (L)); this is the catalytic approach mentioned in the text.
Therefore the ratio of the moving averages of births to that of notifications should provide a suitably robust estimate of the degree of under-notification.
Our results could likely reflect the degree of under-notification rates in the different areas of the country.
The persistence of varicella hospitalizations in the 8 Regions indicates the presence of a greater number of cases than those reported, and the need to better quantify the degree of under-notification, especially in some areas of the country.
This age-dependent variation in the estimated degree of under-notification may be due to (a combination of) age differences in disease severity, the likelihood of contacting primary health care, diagnostic practice, and/or reporting bias.
If only the records that were georeferenced are considered, the number of cases decreased between week 24 and week 42 (the second half of the year), although there was a certain degree of fluctuation in notifications.
Therefore, it is believed that the degree of compliance in disease notification over the study period was consistent.
Due to mandatory reporting, it is believed that the degree of compliance in disease notification over the study period was consistent.
The 3 to 4-year periodicity trend in pertussis dynamics has been observed in countries with very different vaccination levels and socio-demographic conditions [ 3], suggesting that other factors are operating beyond the role of susceptible recruitment and vaccination coverage [ 3], such as, population density, urbanization and the degree of biases in the notification of the disease.
There was a sense expressed by some participants that there was an unreasonable degree of randomness in how notifications were handled.
